Cryosphere carbon dynamics control early Toarcian global warming and sea level evolution

  title={Cryosphere carbon dynamics control early Toarcian global warming and sea level evolution},
  author={Wolfgang Ruebsam and Bernhard Mayer and Lorenz Schwark},
  journal={Global and Planetary Change},
Abstract The Earth's cryosphere represents a huge climate-sensitive carbon reservoir capable of releasing carbon dioxide (CO2) and methane (CH4) from permafrost soils or gas reservoirs capped by permafrost and ice caps upon rising global temperatures. Carbon release from these reservoirs has the potential to further accelerate global warming. Present day cryosphere demise is a focus of scientific research. The potential role of cryosphere carbon reservoirs in Mesozoic climate perturbations is… 
Impact of a northern-hemispherical cryosphere on late Pliensbachian–early Toarcian climate and environment evolution
Abstract The historical view of an equable Jurassic greenhouse world has been challenged by recent studies documenting recurrent alternation between contrasting climate modes. Cooling of
δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients
Stable carbon isotopes (δ13C) of molecular land plant fossils complemented by bulk organic and inorganic carbon fractions for early Toarcian (Early Jurassic) sediments that coincided with global warming and a carbon cycle perturbation are reported.
Direct coupling between carbon release and weathering during the Toarcian oceanic anoxic event
Silicate weathering represents a major feedback mechanism in the Earth’s climate system, helping to stabilize atmospheric CO2 levels and temperature on million-year time scales. On shorter time
Molecular paleothermometry of the early Toarcian climate perturbation
Abstract In this paper, we use molecular paleothermometry, based on the TEX86 proxy derived from fossilized archaeal lipids, to reconstruct absolute sea surface temperatures (SSTs) for the northwest
Evidence for local carbon-cycle perturbations superimposed on the Toarcian carbon isotope excursion.
Connecting new carbon and oxygen isotope data with documentary lipid biomarkers shows that the global carbon cycle during the Toarcian OAE was disturbed by enhanced green sulfur bacteria (GSB) metabolisms and early diagenesis at local scales.
Transient and secular changes in global carbon cycling during the early Bajocian event: Evidence for Jurassic cool climate episodes
Abstract The early Bajocian event was characterized by a protracted, ca. 4 Myr-long positive carbon isotope excursion that has been recognized in both marine and continental records. It is
Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations
The effects of pulsed carbon release from the Karoo LIP on atmospheric pCO2 and δ13C of marine sediments are explored, using the GEOCLIM carbon cycle model and it is shown that a total of 20,500 Gt C replicates the Toarcian pCO 2 and ε13C proxy data, and that thermogenic carbon represents a plausible source for the observed negative CIEs.
Toarcian climate and carbon cycle perturbations – its impact on sea-level changes, enhanced mobilization and oxidation of fossil organic matter
Abstract Organic geochemistry and palynology reveal major organofacies changes in the marginal marine Polish Basin during the early Toarcian linked to changes in environmental conditions. Increasing
The Toarcian Oceanic Anoxic Event: where do we stand?
Abstract The study of past climate changes is pivotal for understanding the complex biogeochemical interactions through time between the geosphere, atmosphere, hydrosphere and biosphere, which are
Carbon-cycle changes during the Toarcian (Early Jurassic) and implications for regional versus global drivers of the Toarcian oceanic anoxic event
Abstract The Early Jurassic Toarcian oceanic anoxic event (T-OAE) is characterized by an extinction event, a major sea-level rise, enhanced marine primary productivity, elevated seawater


Hydrothermal venting of greenhouse gases triggering Early Jurassic global warming
Abstract The climate change in the Toarcian (Early Jurassic) was characterized by a major perturbation of the global carbon cycle. The event lasted for approximately 200,000 years and was manifested
Past extreme warming events linked to massive carbon release from thawing permafrost
Between about 55.5 and 52 million years ago, Earth experienced a series of sudden and extreme global warming events (hyperthermals) superimposed on a long-term warming trend. The first and largest of
Glendonites track methane seepage in Mesozoic polar seas
During the Phanerozoic, Earth has experienced a number of transient global warming events associated with major carbon cycle perturbations. Paradoxically, many of these extreme greenhouse episodes
Polar record of Early Jurassic massive carbon injection
Abstract The Toarcian Oceanic Anoxic Event (T-OAE) (ca. 182 Myr, Early Jurassic) represents one of the best-recognized examples of greenhouse warming, decreased seawater oxygenation and mass
Astronomical pacing of methane release in the Early Jurassic period
High-resolution organic carbon-isotope data from well-preserved mudrocks in Yorkshire, UK, are reported, providing strong evidence that methane release proceeded in three rapid pulses and that these pulses were controlled by astronomically forced changes in climate, superimposed upon longer-term global warming.
High-resolution carbon isotope records of the Toarcian Oceanic Anoxic Event (Early Jurassic) from North America and implications for the global drivers of the Toarcian carbon cycle
The Mesozoic Era experienced several instances of abrupt environmental change that are associated with instabilities in the climate, reorganizations of the global carbon cycle, and elevated
Carbon sequestration in an expanded lake system during the Toarcian oceanic anoxic event
The Early Jurassic Toarcian oceanic anoxic event (~183 Ma) was marked by marine anoxia–euxinia and globally significant organic-matter burial, accompanied by a major global carbon-cycle perturbation
Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event
The enhanced weathering modulated by initially increased pCO2 levels would have operated as both a direct and indirect negative feedback to end the Toarcian Oceanic Anoxic Event from an open ocean sedimentary succession from western North America.
Secular environmental precursors to Early Toarcian (Jurassic) extreme climate changes
The Early Toarcian Oceanic Anoxic Event (T-OAE), about 183 myr ago, was a global event of environmental and carbon cycle perturbations, which deeply affected both marine biota and carbonate
Permafrost carbon-climate feedbacks accelerate global warming
A terrestrial ecosystem model that includespermafrost carbon dynamics, inhibition of respiration in frozen soil layers, vertical mixing of soil carbon from surface to permafrost layers, and CH4 emissions from flooded areas is used, to explore the potential for carbon-climate feedbacks at high latitudes.